Tap Drill and Thread Height Chart
Thread Ma
j
or Threads
p
er
Tap Drill Tap Tap Drill Theoretical
%
Size Diameter Inch
(
TPI
)
Range Drill Decimal of Thread
0-80 0.0600 80 0.0465 - 0.0514
3/64 0.0469 80.7%
1-64 0.0730 64 0.0561 - 0.0623
53 0.0595 66.5%
53 0.0595 74.8%
1/16 0.0625 58.2%
52 0.0635 52.7%
51 0.0670 81.9%
50 0.0700 69.0%
49 0.0730 56.0%
50 0.0700 78.8%
49 0.0730 64.0%
48 0.0760 85.0%
5/64 0.0781 77.2%
47 0.0785 75.8%
2mm 0.0787 75.0%
46 0.0810 66.5%
45 0.0820 62.8%
46 0.0810 77.6%
45 0.0820 73.3%
44 0.0860 56.0%
44 0.0860 80.1%
43 0.0890 70.8%
42 0.0935 57.0%
3/32 0.0937 56.4%
42 0.0935 68.4%
3/32 0.0937 67.6%
41 0.0960 59.1%
40 0.0980 83.1%
39 0.0995 78.5%
38 0.1015 72.4%
37 0.1040 64.7%
38 0.1015 79.6%
37 0.1040 71.1%
36 0.1065 62.7%
37 0.1040 83.8%
36 0.1065 77.6%
7/64 0.1094 70.5%
35 0.1100 69.0%
34 0.1110 66.5%
33 0.1130 61.6%
34 0.1110 83.1%
33 0.1130 77.0%
32 0.1160 67.7%
3mm 0.1181 61.3%
8-32 0.1640 32 0.1300 - 0.1389
29 0.1360 69.0%
29 0.1360 77.6%
28 0.1405 65.1%
9/64 0.1406 64.8%
26 0.1470 79.4%
25 0.1495 74.8%
24 0.1520 70.2%
23 0.1540 66.5%
24 0.1520 81.9%
23 0.1540 77.6%
5/32 0.1562 72.9%
400.13806-40
0.190010-28
240.190010-24
360.16408-36
560.09903-56
28
5-40
480.11204-48
400.11204-40
0.08602-56
320.13806-32
440.12505-44
400.1250
720.07301-72
480.09903-48
2-64 0.0860 64
56
0.0979 - 0.1062
0.0894 - 0.0968
0.0849 - 0.0939
0.0797 - 0.0865
0.0764 - 0.0845
0.0691 - 0.0753
0.0667 - 0.0737
0.0580 - 0.0635
0.1510 - 0.1600
0.1450 - 0.1555
0.1340 - 0.1416
0.1110 - 0.1186
0.1040 - 0.1140
0.1004 - 0.1079
Tap Drill & Thread Height Chart
This chart d isp lays a var ie ty of UN Thread sizes, their likely Tap Drills and the resulting Theoretical
Thread Height Pe rce ntag e. This per centag e is thoeretical as holes are often drilled slightly oversized.
Typically, tap drills are selected to result in a 60% - 75% thread height. There is neglible increased
strength in threads with more than 60% thread height and larger tap drills are preferred for their
strength and speed.
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